CN110630985A

CN110630985A - Projection lamp system for oblique projection

Info

Publication number: CN110630985A
Application number: CN201911001419.8A
Authority: CN
Inventors: 江程; 南基学
Original assignee: Guangdong Jia Jia Photoelectric Polytron Technologies Inc
Current assignee: Guangdong Jia Jia Photoelectric Polytron Technologies Inc
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2019-12-31

Abstract

The invention provides a projection lamp system for oblique projection, which comprises a light source, wherein one side of a light emitting surface of the light source is sequentially provided with a collimating lens, a projection source and a projection lens group, a projection pattern is arranged in the projection source, two ends of the projection pattern are respectively a far projection point and a near projection point, the center of the projection pattern is collinear with an optical axis of the projection lens group, the distance between the optical axis of the light source and the far projection point is D, the distance between the optical axis of the light source and the near projection point is D, and D is less than D. The invention reasonably distributes the light energy distribution in the projection lamp system, reduces the incident angle of the light entering the far projection point, thereby effectively improving the light energy entering the far projection point, when in inclined projection, the light spot far away from the projection lamp system has enough high brightness which is basically equal to the light spot near the projection lamp system, and the whole light spot formed by the projection lamp system is clear and bright and has uniform brightness at each position.

Description

Projection lamp system for oblique projection

Technical Field

The invention relates to a projection lamp system, and particularly discloses a projection lamp system for oblique projection.

Background

The projection technology is widely applied to the fields of image display, welcome illumination, stage illumination and the like, a traditional projection lamp system mainly comprises a projection source such as an LED (light emitting diode), a collimating lens, a film and the like and a projection unit lens group, an imaging light path of the traditional projection lamp system is shown in figure 1, and the functions of projection and illumination are realized through a lens group after light irradiated by a light source passes through the projection source to form shaped light.

The projection lamp can also be used outside the automobile body, and the projection lamp can be used as a welcome lamp or a Logo lamp when arranged on the side face of the automobile body, and part of the projection lamp is arranged in the front of and behind the automobile body and used as a warning reminder. When the projection lamp is inclined to the ground for projection, the problem of uneven projection light spot brightness exists, and the light spot brightness far away from the projection lamp is insufficient.

Disclosure of Invention

In view of the above, it is desirable to provide a projection lamp system for oblique projection, which can form a clear and bright projection spot during oblique projection.

The projection light system comprises a light source, wherein one side of a light emitting surface of the light source is sequentially provided with a collimating lens, a projection source and a projection lens group, a projection pattern is arranged in the projection source, a far projection point and a near projection point are respectively arranged at two ends of the projection pattern, the center of the projection pattern is collinear with an optical axis of the projection lens group, the distance between the optical axis of the light source and the far projection point is D, the distance between the optical axis of the light source and the near projection point is D, and D is less than D.

Furthermore, at least one plane of the collimating lens is a non-rotation symmetrical plane.

Further, the incidence angle projected to the far projection point by the collimating lens is α, α <10 °.

Further, the projection source is a film.

Furthermore, the projection lens group comprises a first convex lens, a concave lens and a second convex lens which are arranged in sequence, and the first convex lens is positioned on one side of the concave lens close to the projection source.

Further, the optical axes of the first convex lens, the concave lens and the second convex lens are collinear.

The invention has the beneficial effects that: the invention discloses a projection lamp system for oblique projection, which reasonably distributes light energy distribution in the projection lamp system, and reduces the incident angle of light rays entering a far projection point, thereby effectively improving the light energy entering the far projection point.

Drawings

FIG. 1 is a schematic diagram of an imaging light path of a conventional projection lamp system.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic diagram of the energy harvesting of the present invention.

Fig. 4 is a schematic diagram of the imaging optical path of the present invention.

Fig. 5 is a schematic structural diagram of oblique projection.

Fig. 6 is a distribution diagram of the projected spot illuminance of a conventional projection lamp system.

FIG. 7 is a projected speckle illumination distribution diagram of the present invention.

The reference signs are: the projection lens comprises a light source 10, a collimating lens 20, a projection source 30, a projection pattern 31, a far projection point 311, a near projection point 312, a projection lens group 40, a first convex lens 41, a concave lens 42 and a second convex lens 43.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 1 to 7.

The embodiment of the invention discloses a projection lamp system for inclined projection, as shown in fig. 2, comprising a light source 10, a collimating lens 20, a projection source 30 and a projection lens group 40 are sequentially arranged on one side of a light-emitting surface of the light source 10, a projection pattern 31 is arranged in the projection source 30, a far projection point 311 and a near projection point 312 are respectively arranged at two ends of the projection pattern 31, a projection light spot formed by the far projection point 311 is positioned at one end far away from the projection lamp system, a projection light spot passing through the near projection point 312 is positioned at one end close to the projection lamp system, the center of the projection pattern 31 is collinear with an optical axis of the projection lens group 40, the center of the projection pattern 31 is positioned at the center of a connecting line of the far projection point 311 and the near projection point 312, a connecting line between two surface vertexes of the collimating lens 20 is not coaxial with the projection lens group 40, the distance between the optical axis of the light source 10 and the far, d < D, i.e. the optical axis of the light source 10 is located close to the far projection point 311, the incident angle of the light beam incident on the far projection point 311 from the collimating lens 20 is α, the incident angle of the light beam incident on the near projection point 312 from the collimating lens 20 is β, α > β, once the incident angle is larger than the aperture angle, the part of the light beam cannot enter the imaging system, i.e. cannot pass through the projection source 30, so that more energy enters the far projection point 311, and less energy enters the near projection point 312, i.e. the light intensity at the near projection point 312 is smaller, and the light intensity at the far projection point 311 is larger, to ensure that the projection illumination far from the projection lamp system is large enough, and the energy collection diagram is shown in fig. 3, and the imaging optical path diagram is.

As shown in fig. 5, in oblique projection, the inclination angle is θ, the height of the projection lamp system is h, the illumination is E, the light intensity is I, and the light intensity I satisfies the following formula:

when the height h is fixed, the illumination E of each position needing to be projected is equal, the light intensity I is inversely proportional to the inclination angle theta, and the larger the inclination angle theta is, namely the farther the projection distance is, the larger the required light intensity I is. The optical axis of the light source 10 is arranged close to the far projection point 311, so that the light energy at the far projection point 311 can be effectively improved, and the illumination distribution of the projection light spots at each position of final projection is uniform.

When the inclination angle theta of the projection lamp system is 45 degrees and the height h is 0.8m, the illumination distribution diagram of the traditional projection lamp is shown in fig. 6, and the illumination distribution diagram of the projection lamp system is shown in fig. 7.

The invention reasonably distributes the light energy distribution in the projection lamp system, reduces the incident angle of the light entering the far projection point, thereby effectively improving the light energy entering the far projection point, when in inclined projection, the light spot far away from the projection lamp system has enough high brightness which is basically equal to the light spot near the projection lamp system, and the whole light spot formed by the projection lamp system is clear and bright and has uniform brightness at each position.

In this embodiment, at least one plane of the collimating lens 20 is a non-rotationally symmetric plane, and the non-rotationally symmetric plane is configured to cooperate with a light source deviated from the projection lens group 4010, the high-efficiency light-gathering effect is realized, most of light can pass through the projection pattern 31 in the projection source 30, and the non-rotational symmetry plane of the collimating lens 20 can be expressed by multi-order xy polynomials as:

wherein z is the height value of the surface type, C vertex curvature, k is the conic coefficient, C_jWhen the first-order differential of z is 0, only one solution is provided for ensuring that only one local maximum is provided and the surface shape is smooth.

In the present embodiment, the incident angle projected to the far projection point 311 via the collimator lens 20 is α, α <10 °.

In the embodiment, the projection source 30 is a film, the projection pattern 31 on the film is a light-transmitting pattern, and the angle of the chief ray collimated to reach each field of view on the projection pattern 31 is β, β ≈ 0 °.

In the present embodiment, the projection lens group 40 includes a first convex lens 41, a concave lens 42 and a second convex lens 43 arranged in this order, and the first convex lens 41 is located on the side of the concave lens 42 close to the projection source 30.

Based on the above embodiment, the optical axes of the first convex lens 41, the concave lens 42, and the second convex lens 43 are collinear.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The projection lamp system for oblique projection is characterized by comprising a light source (10), wherein a collimating lens (20), a projection source (30) and a projection lens group (40) are sequentially arranged on one side of a light emergent surface of the light source (10), a projection pattern (31) is arranged in the projection source (30), two ends of the projection pattern (31) are a far projection point (311) and a near projection point (312), the center of the projection pattern (31) is collinear with an optical axis of the projection lens group (40), the distance between the optical axis of the light source (10) and the far projection point (311) is D, the distance between the optical axis of the light source (10) and the near projection point (312) is D, and D is less than D.

2. A projection lamp system for oblique projection as claimed in claim 1, characterized in that at least one plane of the collimator lens (20) is a non-rotationally symmetrical plane.

3. A projection lamp system for oblique projection as claimed in claim 1 or 2, characterized in that the angle of incidence onto the far projection point (311) via the collimator lens (20) is α, α <10 °.

4. A projection lamp system for oblique projection as claimed in claim 1, characterized in that the projection source (30) is a film.

5. A projection lamp system for oblique projection as claimed in claim 1, characterized in that the projection lens group (40) comprises a first convex lens (41), a concave lens (42) and a second convex lens (43) arranged in this order, the first convex lens (41) being located on the side of the concave lens (42) adjacent to the projection source (30).

6. A projection lamp system for oblique projection as claimed in claim 5, characterized in that the optical axes of the first convex lens (41), the concave lens (42) and the second convex lens (43) are collinear.